New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  foo: Ember.A([{label: 'A'}, {label: 'B'}, {label: 'C'}]),
  
  actions: {
    swap() {
      this.set('foo', Ember.A([{label: '1'}, {label: '2'}, {label: '3'}]))
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<button {{action 'swap'}}>Swap</button>
{{#my-component someArray=foo as |item|}}
	{{item.label}}
{{/my-component}}
<br>
<br>

templates.components.my-component.hbs

{{#each someArray as |item|}}
  {{yield item}}
{{/each}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}